Crota's End made people extremely lazy and bad at the game in general, especially with the Gjallahorn dependence that started to develop. To start most groups went like this:
-1 player cheeses bridge section with exploding lamp and rock
-Despawn all the enemies and snipe the Ogres
-1 player grenades the Wizards out of the rooms, everyone that isn't good dies and someone finishes the Deathsinger off
-1 player runs sword while people shoot Gjallahorns
They fixed things and then it was:
-1 hunter sneaks through to safe rock
-Every dies and a Warlock self revives
-Same
-Same
Then they tried again to fix the bridge:
-One person goes across with sword, hides behind pillar, everyone left wipes, warlock res and then snipe ogres.
It was infuriating to play CE with some groups, it's like some people didn't even want to play at all. I actually had people switch to low level Warlocks just for the bridge section so they didn't have to play the encounter.
This carried over into PoE (Gjallahorn burn every boss which led to an unnecessary Qodron nerf) and King's Fall where people aren't adaptable to rough situations at all. Getting a PUG group to think on the fly in King's Fall is really hard. Doing Skolas carries was fun because it required people to think on the fly in the patched encounter. It was fun to see people grow into themselves and start playing on good instinct instead of strict instruction.